caps off. cars are being loaded and show no leakage with They shall be retested by applying an air pressure of 100 psi through openings (3) Securing closures. All closures of in the tank shell and must show no openings in tank cars and of their pro- leakage. tective housings must be properly se- (5) Interior heater systems must be cured in place by the use of a bar, wrench, retested hydrostatically at 200 psi and or other suitable cool. A wrench having must show no leakage. a handle at least 36 inches long must be (6) Safety relief valves must be reused to apply the outlet valve cap. tested with air or gas and must start to Manway covers and outlet valve caps discharge at the pressure prescribed must be made tight against leakage of within plus or minus 3 percent except vapor and liquid, by use of gaskets of that if the start-to-discharge pressure suitable materials, before is under 100 psi, the valve must start to tendered to carrier for transportation. discharge at the pressure prescribed Luting materials must not be used in within plus or minus 3 psi. Valves must outlet cap or on threads of bottom outlet. be vapor tight at the prescribed pres(4) Inspection of safety relief devices sure. on class DOT-106A and 110A tanks. (7) All DOT tanks built to one speciSafety relief devices of the frangible disc fication and authorized to be stenciled or fusible plug type used on tanks of to another specification must be retested classes DOT-106A or 110A must be in in accordance with the higher specificaspected before each loaded trip of tank tion and the test pressure stenciled acby removing at least one vent for visual cordingly on the tank or jacket. inspection; if it shows signs of deteriora (8) Retests of tanks and safety relief tion, all devices must be removed and devices must be reported by party makinspected and those which do not meet ing tests to car owner. Reports must the requirements must be renewed. show initials and numbers of cars, pres (c) Periodic retest and reinspection of sure to which tested, date and place of single-unit tank car tanks. (1) Tanks, test, and by whom tested. Reports of interior heater systems, and safety re latest retest must be retained by owner lief valves must be retested periodically until the next retest has been accomas specified in Retest Table 1 of this plished and recorded. paragraph. Retests may be made at any (9) After repairs requiring welding, time during the calendar year the retest riveting, caulking of rivets, or hot or falls due except as provided in the notes. cold forming to restore tank contour, Periodic retest of exterior heater sys tanks must be retested as specified in tems is not a specification requirement. Retest Table 1 of this paragraph before (2) Each tank must be retested by return to service. Glass, lead, or rubbercompletely filling the tank and manway lined tanks must be retested before lining nozzle or expansion dome with water is renewed. Interior heater systems must or other liquid of similar viscosity ex- be retested before return to service after cept as otherwise provided for in Note (d) repairs or renewals of any part of the to Retest Table 1 and applying the system. specified pressure for 10 minutes if the (10) The month and year of tests of tank is not insulated, or 20 minutes if tanks, safety relief valves, heater system the tank is insulated. There shall be and pressure to which tested must be no leakage or evidence of distress. The stenciled on the tank or on jacket i tank insulation and jacket need not be insulated. removed unless leakage is indicated by a (d) Periodic retest and reinspection of drop in pressure. The liquid tempera- tanks other than single-unit tank car ture must not exceed 100° F, during the tanks. (1) Tanks designed to be retest. Calking of welded joints to stop moved from cars for filling and emptyleaks developed during retests is pro ing and tanks to spec. DOT 107A**** hibited. and their safety relief devices must be re(3) Tanks in service 10 years or over tested periodically as specified in Retest must be internally inspected and interior Table 2 of this paragraph. Retests may heater systems inspected for defects be made at any time during the calendar which would make leakage or failure year the retest falls due. probable during transit. (2) Each tank, except as provided in (4) Anchor rivet housings, if used, subparagraph (d) (9) of this section, must not be removed during retest. must be subjected to the specified hydro static pressure and its permanent ex- tank must not leak or show evidence of pansion determined. Pressure must be distress. maintained for 30 seconds and as much (3) Each tank, except tanks to spec. longer as may be necessary to secure DOT 107A, must also be subjected to incomplete expansion of the tank. Pres- terior air pressure test of at least 100 sure gauge must permit reading to an psi under conditions favorable to detecaccuracy of 1 percent. Expansion tion of any leakage. No leaks shall gauge must permit reading of total ex- appear. pansion to an accuracy of 1 percent. Ex- (4) Safety relief valves must be repansion must be recorded in cubic cen- tested by air or gas, must start to distimeters. Permanent volumetric expan- charge at or below the prescribed pression must not exceed 10 percent of total sure and must be vaportight at or above volumetric expansion at test pressure and the prescribed pressure. RETEST TABLE I DOT 103 103AL. 114A 340-W See tootnotes at end of table. • Tanks and safety relief valves in chlorine service must be retested every 2 years at any time during the calendar month the retest falls due. See $ 173.314(c) Note 12. b Spec. 103C-W, and 103A-AL-W cars built prior to Aug. 31, 1956, equipped with safety relief valves set to start to discharge at 45 psi may be continued in service. Such valves may be set to start to discharge at 35 psi by installing a spring suitable for the lower pressure. . See praragraph (a)(2) Note 4 or this section. d A commodity for which a tank is approved may be used for filling tank and dome when retesting tanks in service not over 10 years. • Safety relief valve retest period is same as tank retest period. "Nickel clad tanks in brornine service and any glass, rubber, or lead lined tank need not be periodically retested, but the interior heater systems and safety reliei valves must be retested at the prescribed interval. See also paragraph (c)(9) of this section. « Il safety relief valves are used in combination with breaking pins designed to break at 225 psi, tbe safety relie! valves must be retested and must start to discbarge at 213 pisi plus or minus 3 perceni. b If safety relief valves are used in combination with breaking pins designed to break at 375 psi, the safety relief valves must be retested and must start to discharge at 360 psi plus or minus 3 percent. i Tanks and safety relief devices in hydrocyanic acid serviie musi be retested and inspected by a written procedure filed with and approved by the Bureau of Explosives. When the retest in terval requirement changes due to the age of the tank, the new retest in terval specified is effective from the last retest date. Safety relief valves in bromine service must be retested every 2 years. "Tank's complying with this specification need not be periodically retested, but safety relier devices must be retested every 5 years. When a safety relief valve is used in combination with a breaking pin derice, the breaking pin device shall be designed to fail at 8 pressure of 75 percent of the tank test pressure and safety relief valve shals be set for å startto-discharge pressure of 71 percent of the tank tesi pressure. If the alternate safety relief valve starl-10-iischarge pressure setting is used, the start-to-discharge pressure of safety reliel valves shall be in accordance with the provisions of $174 102-11 of this chapter. DŘetest period for interior heater systems on cars so equipped is 10 years. (5) Frangible discs or fusible plugs ing tests to owner of tank. Reports must be removed from the tank and must show registered identifying mark visually inspected. and serial number, pressure to which (6) Tanks must be retested as speci tested, date and place of test, and by fied in Retest Table 2 of this paragraph whom tested. Reports of latest retest before return to service after repairs in must be retained by owner until the next volving welding or heat treatment. retest has been accomplished and (7) The month and year of test, fol recorded. lowed by a “V” if visually inspected as described in subparagraph (d)19) of this (9) Tanks of DOT 106A and DOT section, must be plainly and permanently 110A-W "$$ 179.300. 179.301, 179.302 of stamped into the metal of one head or this chapter) specifications used excluchime of each tank passing test; for ex sively for transporting fluorinated hydroample, 1-60 for January 1960. On DOT carbons and mixtures thereof which are 107A**** tanks, the date must be free from corroding components may be stamped into the metal of the marked given a periodic complete internal and end; except that if all tanks mounted on external visual inspection in lieu of the a car have been tested, the date may be periodic hydrostatic retest. Visual inspecstamped into the metal of a plate per- tions shall be made only by competent manently applied to the bulkhead on the persons. Acceptance or rejection of tanks "A" end of the car. Date of previous must be based upon the methods used tests and all prescribed markings must for cyiinders in CGA Pamphlet C-6, and be kept legible. the results must be recorded on a suit. 18) Retests of tanks and safety relief able data sheet, the completed copies of devices must be reported by party mak- which must be kept by the owner as a permanent record. The points to be recorded and checked on these data sheets are: Date of inspection (month and year followed by a “V” to indicate visual inspection); DOT specification number: tank identification (registered symbol and serial number, date of manufacture and ownership symbol); type of protective coating (painted, etc., and statement as to need of refinishing or recoating); conditions checked (leakage, corrosion, gouges, dents or digs, broken or damaged chime or protective ring, fire, fire damage, internal condition); disposition of tank (returned to service, returned to manufacturer for repair, or scrapped). (e) Tank car tanks subjected to the action of fire. (1) Tank car tanks of other than classes DOT 106A, 107A or 110A bearing evidence of damage to the metal by fire must be withdrawn from transportation service except that if the damage to the tank is local only or confined to not more than 25 percent of the tank surface, the damaged material may be replaced. See paragraph (f) (1) of this section for the procedure for handling tank car tanks with more than 25 percent of the tank surface damaged, e Il DOT 107 A**** tanks are used for transportation of flammable gases, one frangible disc from each car must be burst at the interval prescribed. The sample disc must burst at a pressure not exceeding the marked test pressure of the tank and not less than 710 of the marked test pressure. If the sample disc does not burst within the prescribed limits, all discs on the car must be replaced. The hydrostatic expansion test pressure must at least equal the marked test pressure. · DOT 107A **** tanks used exclusively in helium gas service shall be exempt from the quinquennial hydrostatic retest requirement until Dec. 31, 1971. This exemption shall be applicable to tank cars presently operated in helium service by the U.S. Bureau of Mines and to additional cars that are placed in helium service by the Bureau of Mines. See $ 173.31(d)(9). • Safety relief valves of the spring-loaded type on tanks used exclusively for fluorinated hydrocarbons and mixtures thereof which are free from corroding components may be retested every 5 years. (2) Tank car tanks of classes DOT 106A, 107A or 110A bearing evidence of damage to the metal by fire must be withdrawn from transportation service until they have been inspected inside and outside to determine that no reduction in wall thickness has resulted, and have been heat-treated and retested. These operations must be carried out, supervised and reported as prescribed by the specifications for original heat treatment and test. (f) Repairs or alterations. (1) For procedure to be followed in making repairs or alterations to all tank car tanks and securing approval therefor, sce Appendix R, Association of American Railroads Specifications for Tank Cars. (2) After alterations of tank cars or equipment therefor from original design, a certificate of compliance with the respective specification must be furnished to the car owner, to the Bureau of Explosives, and to the Secretary, Mechanical Division, Association of American Railroads. (18 U.S.C. 831-835; sec. 9, 49 U.S.C. 1657) 129 F.R. 18671, Dec. 29, 1964, as amended by Order 66, 30 F.R. 6743, Apr. 23, 1965; Order 67, 30 F.R. 7420, June 5, 1965; Order 71. 31 F.R. 9068, July 1, 1966; Amdt. 173-16, 34 F.R. 18247, Nov. 14, 1969; Amdt. 173-18, 35 F.R. 1109, Jan. 28, 1970; Amdt. 173-25, 35 F.R. 7120, May 6, 1970; Amdt. 173--35, 35 F.R. 14402, Sept. 12, 1970; Amdt. 173-37, 35 F.R. 16634, Oct. 27, 1970; Amdt. 173-40, 36 F.R. 64, Jan. 5, 1971) § 173.32 Qualification, maintenance, poses of establishing maximum and miniand use of portable tanks. mum design pressures, the re-rated working pressure shall be considered as the equiva(a) Except as otherwise provided in lent of the design pressure as defined in the this section, every portable tank con- specification. tainer used for the transportation of (2) Loading and unloading accesdangerous articles shall fulfill the re sories, valves, piping, fittings, safety and quirements of the specification and regu gauging devices, do not have to comply lations for the transportation of the par with the requirements for the particular ticular commodity. A manufacturer's location on the tank. data report of the portable tank con (3) Tanks having capacities of betainer shall be procured and retained in tween 750 pounds and 1,000 pounds of the files of the owner during the time water shall be considered as portable that such portable tank container is used tank containers for the purposes of this for such service. part. In lieu of using safety relief valves (1) When a portable tank container on such containers they may be equipped is used as a cargo tank container, it shall with fusible plugs only when the concomply with all the requirements pre tainer is filled by weight. Size, number, scribed for cargo tank containers. (See and location, as well as character and § 173.33.) physical properties of fusible plugs shall (2) Portable tank containers for trans be approved by the Bureau of Explosives. portation as cargo on vessels in com These containers shall be marked "ICC merce subject to the jurisdiction of the Specification 51S”. United States Coast Guard shall not ex (4) Specification requirements as to ceed a loaded weight of 20,000 pounds. stress-relieving and radiographing are Nothing contained in this section shall be waived. so construed as to pertain to transporta (c) Any portable tank container of tion on car floats and car ferries, nor ICC Specification 50 · fulfilling the reshall such limitation in weight apply to quirements of that specification may be trailerships or containerships if ap continued in service for transportation proved under Coast Guard Regulations. of a liquefied petroleum gas if it is re(b) Any portable tank container con tested every five years in accordance structed prior to May 15, 1950, complying with the requirements of paragraph (e) with the requirements of either the A. S. (3), (4), and (5) of this section: ProM. E. Code for Unfired Pressure Vessels, vided, That it is in and can be main1946 Edition, or the A. P. I.-A. S. M. E. tained in safe operating condition for the Code for Unfired Pressure Vessels, 1943 transportation of that gas. In this case Edition, may be used for the transportation of liquefied compressed gas, pro the container may retain its original markings. vided it fulfills all the requirements of (d) [Reserved] this part and specifications for the par (e) Portable tank containers used for ticular gas or gases to be transported the transportation of dangerous articles therein and shall be marked "ICC Speci shall be retested in accordance with the fication 51X” on the plate required by following and shall not be kept in or the specification, except as modified by returned to transportation service unany or all of the following: less they shall have successfully with(1) Tanks designed and constructed stood the following prescribed tests, as in accordance with Pars. U-68, U-69, or appropriate in each instance: U-201 of the A. S. M. E. Code may be (1) Every portable tank container used. Tanks designed and constructed manufactured in accordance with DOT in accordance with Pars. U-68 or U-69 Specification 60 ($ 178.255 of this chapmay be re-rated at a working pressure ter) shall be tested at the end of the 25 percent in excess of the design pres first 4 year period after the original test sure for which the tank was originally and each 2 years thereafter up to 12 constructed. If advantage is taken of years of service and annually thereafter. the increased rating, the re-rated pres Except that retests are not required on sure shall be marked on the plate as such tanks equipped with rubber lining follows: but retests must be made before such Re-rated working pressure psig. tanks are relined. Retest of SpecificaNOTE 1: For purposes of setting safety relief valves, pressure control valves and 1 Use of existing portable tanks authorized, .establishing retest pressure, and for pur- but new construction not authorized. |